Steven can be fast, sometimes, but consistency has never really been his strength. In the moments that he's turned to stare at Jamie's frothing assault with a look of horror, Irvine's managed to slip behind him and-

Get tackled by his dad, apparently. As relieved as he is to not get kicked in the spine, he's terrified of the idea of his dad squaring off with this guy - he gives Jamie one last glance, and then throws away his shield, complete with the vampire clinging to it. Then, he's leaping after his dad and trying to lock both of them into a defensive bubble, before Irvine has a chance to hurt him even more.

He leaps to embrace him, and hopes for the best.